异常

¥Exception

当发生致命错误（例如身份验证失败）时，必须抛出 HTTPException。

¥When a fatal error occurs, such as authentication failure, an HTTPException must be thrown.

抛出 HTTPException

¥throw HTTPException

此示例从中间件抛出 HTTPException。

¥This example throws an HTTPException from the middleware.

import { HTTPException } from 'hono/http-exception'

// ...

app.post('/auth', async (c, next) => {
  // authentication
  if (authorized === false) {
    throw new HTTPException(401, { message: 'Custom error message' })
  }
  await next()
})

你可以指定要返回给用户的响应。

¥You can specify the response to be returned back to the user.

import { HTTPException } from 'hono/http-exception'

const errorResponse = new Response('Unauthorized', {
  status: 401,
  headers: {
    Authenticate: 'error="invalid_token"',
  },
})

throw new HTTPException(401, { res: errorResponse })

处理 HTTPException

¥Handling HTTPException

你可以使用 app.onError 处理抛出的 HTTPException。

¥You can handle the thrown HTTPException with app.onError.

import { HTTPException } from 'hono/http-exception'

// ...

app.onError((err, c) => {
  if (err instanceof HTTPException) {
    // Get the custom response
    return err.getResponse()
  }
  // ...
})

cause

cause 选项可用于添加 cause 数据。

¥The cause option is available to add a cause data.

app.post('/auth', async (c, next) => {
  try {
    authorize(c)
  } catch (e) {
    throw new HTTPException(401, { message, cause: e })
  }
  await next()
})